Ether diamines

ABSTRACT

DIAMINIES OF THE FORMULA   H2N-CH2-(CH2)M-CH(-(CH2)N-H)-O-C(-R1)(-R2)-CH(-R3)-CH2-NH2   WHERE N I 5 TO 2/, M IS O TO 15, THE SUM OF N AND M IS 14 TO 20, AND R1 R2 AND R3 ARE HYDROGEN OR SHORT CHAIN ALKYL GROUPS OF 1 TO 4 CARBON ATOMS. DIISOCYANATES DERIVED THEREFROM WITH THE SAME BEING USEFUL FOR PREPARING POLYMERS.

Patented Jan. 11, 1972 starting hydroxy substituted mono-nitriles can be repre- 3,634,516 sented by the following: 9-hexadecenoic (palmitoleic),

ETHER DIAMINES 7-hexadecenoic, 2-hexadecenoic, 2-heptadecenoic, 2-octa- John s h i shorevlewi i g g i fi" Excelsior, decenoic, 3-octadecenoic, 4-octadecenoic, 5-octadecenoic, i 3.5913110 wet 6-octadecenoic (petroselinic), 7-octadecenoic, 8-otcadece N0 fi g 819457 5 mole, 9-.octadecenoic (oleic, elaidic), 10-octadecenoic, Us. CL 9 Claims ll-octadecenoic (vaccenic), 12-octadecenoic, 2-nonadecenoic, 9-eicosenoic (gadoleic), ll-eicosenoic, 13-docosenoic(erucic), ll-docosenoic (cetoleic) and the like.

ABSTRACT OF THE DISCLOSURE 10 The nae-unsaturated nitrile iS condensed With the described hydroxy substituted fatty nitriles using an alkaline Dlammes of the fornmla catalyst and moderate temperatures. A preferred catalyst H is sodium ethoxide prepared by dissolving sodium in ab- 114cm) M solute ethanol. It is also preferred to use an excess of the unsaturated nitrile and temperatures of about 25 to 100 R3 15 C. are preferred. 0(|J(}3CH2NH2 The described dinitriles are then converted to the dit H amines of the present invention by hydrogenation. The

hydrogenation is carried out in the presence of ammonia utilizing a hydrogenation catalyst such as Raney cobalt or Raney nickel.

The following Examples AC are illustrative of the preparation of the starting dinitriles. It is noted that in such examples and the examples of the diamines of the invention to follow (also the diisocyanates prepared The lllreseht lhvehtloh relates to new dlammes- More therefrom), mixtures of position isomers are used and where n is 5 to 20, m is O to 15, the sum of n and m is 14 to 20, and R R and R are hydrogen or short chain 20 alkyl groups of l to 4 carbon atoms. Diisocyanates derived therefrom with the same being useful for preparing polymers.

p i'h: to s diamines P p y prepared. Such mixtures can be separated such as by dfogehatlng dlilltflles ultimately h e from certain chromatography. However, there is ordinarily no reason fatty Compounds and unsaturated hltrllesto do so since the compounds are functionally equivalent.

The new diamines of the present invention have the structural formula: EXAMPLE A A mifxture (140 g},1 (2.5 mole) 01f approximately e ual parts 0 9- and 10- y roxysteary nitrie was eate to HTCHZ) FCTwHQ'FCHZNHQ 50 C. and 2.5 ml. of catalyst solution (made by dissolv- R1 R3 ing 0.5 g. of sodium in 10 g. of absolute ethanol) was 0( .CH NH added. Then 26.5 g. (0.5 mole) of acrylonitrile were added and heating was continued for 3 /2 hours at 5l-64 C. The reaction mixture was cooled to C., another 2.5 Where is 5 t0 m is 0 the sum 0f and m is ml. portion of catalyst solution was added, and then 26.5 14 to 20, and 1 2 and 3 are hydrogen or short Chain g. more acrylonitrile were added over a five minute period alkyl groups of 1 t0 4 Carbon atoms 1 a are Preferably (the temperature increased slightly during this addition). H and it is espeically preferred that the sum of the whole Heating wa ontinued for 3% hours at 52-63 C. After integers n and m is Our new diamines are useful as standing overnight at room temperature, the reaction mixouring agents for p y resins, as corrosion inhibitors, ture was diluted with 280 ml. of hexane and filtered to reand as eofeactahts in the P p 0f Polyamide and move some insoluble material assumed to be polyacrylo- P y resihs- T y find Particular use in the P P nitrile. The filtrate was washed with equal volumes of tion of diisocyanates which in turn can be reacted with 1% b weight ou H 30 then with aturated salt a wide variety of organic compounds containing two or at t i i 2% by weight Na CO then with satumore active hydrogehs to yield P y having utility as rated salt water, and finally with tap water. The washed coatings, moldings and the like- 50 solution was vacuum-stripped of solvent in a rotary evap- The diamines Of 0111' invention are P p y the orator, leaving 157 g. crude product which was a liquid hydrogenation of the corresponding dinitriles. The said i i 8- ()2% nitrogen (Corresponding to 89% cyano dihitriles are P p y the reaction of an B' ethoxystearonitrile and 11% unreacted hydroxystearourated nitrile with a hydroxy substituted fatty nitrile. i i1 Thi product was ifi d to about 95% cyano.

Represehteltifeufi-uhsamreted are acl'ylohitrile, 5 ethoxystearonitrile by cooling it to 4 C. and filtering oif methacryiohltrlle and el'otohohlmle Wlth the first being the hydroxystearonitrile which crystallized out. Infrared the p f ed ea analysis showed that the product was a mixture of 9- and The starting Y Y substltuted fatty Illtflies can be IO-(fi-cyanoethoxy)stearonitrile. These dinitriles have the prepared in a number of ways. One procedure is that set f ula forth in Vander Wal Pat. 2,558,666 which shows the preparation of mixtures of such starting materials by the reaction of sulfuric acid under moderately low temperatures with unsaturated nitriles to form sulfates (sulfuric O-GHQCHrCEN esters) which sulfates are then hydrolyzed to form the and hydroxy substituted fatty nitriles.

The preparation of mono-nitriles from fatty acids and ammonia is well known. This preparation and the con- CH3(CH2)5C(CH2)8CEN ditions useful in same are set forth in Fatty Acids and O OH2CHZ CEN Their Derivatives by A. W. Ralston, 1948, pp. 620-625 (John Wiley & Sons, Inc.). The useful monoethylenically EXAMPLE B unsaturated aliphatic monobasic carboxylic acids which Example A is essentially repeated using the mixture of can be converted to the mono-nitriles and then to the 9- and 10-hydroxy substituted mononitriles obtained from palmitoleic acid. The resulting dinitriles have the formulae:

EXAMPLE C Example A is essentially repeated using the mixture of 11- and 12-hydroxy substituted mononitriles obtained from vaccenic acid. The resulting dinitriles have the formulae:

The following examples are illustrative of the invention without being limiting.

EXAMPLE I A solution of 155 g. of a mixture of 9- and 10- (fl-cyanoethoxy)-stearonitrile as prepared in Example A in 150 g. of methanol and 100 ml. of liquid ammonia was hydrogenated over Raney active cobalt catalyst (approximately 23 g.) by heating at 145-148 C. in an autoclave under a hydrogen pressure of 14252160 p.s.i. until no more hydrogen was absorbed (approximately four hours). The re action mixture was then cooled to room temperature, the excess hydrogen and ammonia vented, the catalyst filtered off, and the methanol removed by vacuum-stripping on a rotary evaporator. The crude product was vacuum-distilled to give a colorless liquid boiling at about 165-175 C. at 0.1 mm. Hg with an amine number of 315. Infrared analysis showed that the product was a mixture of 9- and 10- (y-aminopropoxy)stearylamine. These diamines have the formulae:

l C I EXAMPLE II 'Example I is essentially repeated using the dinitriles of Example B. The resulting diamines have the formulae:

4 EXAMPLE 111 Example I is essentially repeated using the mixture of dinitriles of Example C. The resulting diamines have the formulae:

H OH -(GI-Im-( J-(CHQ)lo-OIIQNHQ O-CH2CH2GH2NH2 As indicated above, our new diamines are particularly EXAMPLE D To a stirred solution of 368 g. of phosgene in 800 ml. of dry toluene was added over a period of one hour a solution of 100 g. of diamine as prepared in Example I in 200 ml. of dry toluene (the reaction temperature, which was initially 15 C., rose to 36 C. during this time). Additional heat was then applied to bring the temperature to 64 C. over a period of three hours, while preventing escape of phosgene by means of a reflux condenser cooled to 5 C. The coolant in the reflux condenser was then changed to tap water to allow escape of excess phosgene and of hydrogen chloride while a slow stream of nitrogen was bubbled through the reaction mixture. The temperature of the reaction mixture was increased to 110 C. over a period of 1 /2 hr. About onefourth of the toluene was then distilled 01f at atmospheric pressure and the remainder under vacuum in a rotary evaporator. The slightly cloudy residual product, amounting to 106 g., was clarified by filtering and then distilled through a falling-film molecular still to give a clear light yellow liquid with a refractive index of 1.459 (11 and an NCO content of 19.6%. Infrared analysis showed that the product was a mixture of 9- and 10-('y-isocyanatopropoxy)-stearyl isocyanate. These diisocyanates have the formulae:

EXAMPLE F Example D is essentially repeated using the mixture of diamines of Example III. The resulting diisocyanate have the formulae:

As indicated above the diisocyanates are particularly valuable for the preparation of polymers by reaction with compounds bearing at least two active hydrogen atoms as determined by the Zerewitinoif method. The Zerewitinoff test is described by Kohler in J. Am. Chem. Soc., 49, 3181 1927). Such polymers are useful especially as coatings for a variety of substrates.

In general, the active hydrogen atoms of compounds reactive with the dissocyanates are attached to carbon, oxygen, nitrogen or sulfur atoms. Compounds containing the following groups will have active hydrogen atoms: primary amino, secondary amino, carboxyl, diazoamino, hydrazino, hydrazo, hydrazono, hydroxyamino, hydroxyl imido, imino, and mercapto. Most often these active hydrogen atoms are attached to oxygen, nitrogen, or sulfur atoms; thus they will be a part of groups such as OH, -SH, NH, NHg, CO H, CONH CONHR where R represents an organic radical, AO O'H, SO NH and CSNH Examples of suitable types of compounds include water, hydrogen sulfide, ammonia, hydroxyl polyesters, polyhydric polyalkylene ether, polyhydric polythioethers, polyacetals, aliphatic polyols, including alkane, alkene and alkyne diols, triols, tetrols and the like, aliphatic thiols including alkane, alkene and alkyne thiols having two or more SH groups; poly amines including both aromatic, aliphatic and heterocyclic diamines, triamines, tetramines and the like; as well as mixtures thereof. Of course, compounds which contain two are more different groups within the above-defined classes may also be used such as, for example, amino alcohols which contain an amino group and a hydroxyl group, amino alcohols which contain two amino groups and one hydroxyl group, aminoacids and the like. Further illustrative classes and specific organic compounds containing active hydrogen atoms useful for preparing polymers are described immediately hereinbelow. 0

Any suitable polyester may be used and may contain terminal hydroxyl groups, terminal carboxylic acid groups, amino groups or the like. Moreover, the polyester may be a polyester amide which was prepared by condensing an amino alcohol containing both free amino groups 5 and free hydroxyl groups with the other components used in the preparation of polyesters. The polyester may be prepared by reacting a polycarboxylic acid or hydroxy carboxylic acid with polyhydric alcohols. It is also possible to use a mixture of polyhydric alcohols and polyamines 0 such as ethylenediarnine, polyethylenediamine, 1,4butylenediamine and the like. Amines such as bis-(2-aminoethyl)ether or amino carboxylic acids such as glycine, alanine, valine, phenylalanine, hydroxyproline and the like may also be used. The polyesters may contain hetero 65 atoms in addition to the ester groups including oxygen, sulfur, nitrogen and the like in the chain. Moreover, the radicals making up the polyester may be either saturated or unsaturated and may contain double or triple bonds as Well as modifying radicals of saturated or unsaturated fatty acids such as oleic acid or fatty alcohols such as oleyl alcohol and the like.

Any suitable polycarboxylic acid may be used in the preparation of the polyesters such as, for example, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid,

pimelic acid, suberic acid, azelaic acid, sebacic acid, brassylic acid, maleic acid, fumaric acid, glutaconic acid, alphahydromuconic acid, beta-hydromuconic acid, alphabutyl-alpha-ethyl-glutaric acid, alpha,beta-diethyl-succinic acid, isophthalic acid, terephthalic acid, hemimellitic acid, trimellitic acid, trimesic acid, mellophanic acid, prehnitic acid, pyromellitic acid, benzenepentacarboxylic acid, 1,4- cyclohexanedicarboxylic acid, and the like. Any suitable polyhydric alcohol may be used in the preparation of the polyesters such as, for example, ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,4-butylene glycol, 1,3-butylene glycol, 1,2-butylene glycol, 1,5-pentanediol, 1,4 pentanediol, 1,3 pentanediol, 1,6-hexanediol, 1,7- heptanediol, glycerine, trimethylolpropane, 1,3,6-hexanetriol, triethanolamine, pentaerythritol, sorbitol and the like.

Any suitable polyhydric polyalkylene ether may be used as the active hydrogen containing compound such as, for example, the condensation product of an alkylene oxide or of an alkylene oxide with a polyhydric alcohol. Any suitable polyhydric alcohol may be used such as those disclosed above for use in the preparation of the hydroxyl polyesters. Any suitable alkylene oxide may be used such as, for example, ethylene oxide, propylene oxide, butylene oxide, amylene oxide, and the like. Of course, the polyhydric polyalkylene ethers can be prepared from other starting materials such as, for example, tetrahydrofuran, epihalohydrins such as, for example, epichlorohydrin and the like as well as aralkylene oxides such as, for example styrene oxide and the like. The polyhydric polyalkylene ethers may have either primary or secondary hydroxyl groups and preferably are polyhydric polyalkylene ethers prepared from alkylene oxides having from two to five carbon atoms such as, for example, polyethylene ether glycols, polypropylene ether glycols, polybutylene ether glycols and the like. It is often advantageous to employ some trihydric or higher polyhydric alc0- hols such as glycerine, trimethylolpropane, pentaerythritol and the like in the preparation of the polyhydric polyalkylene ethers so that some branching exists in the product. Generally speaking, it is advantageous to condense from about 5 to about moles of alkylene oxide per functional group of the trihydric or higher polyhydric alcohol. The polyhydric polyalkylene ethers may be prepared by any known process such as, for example, the process disclosed in 1859 by Wurtz and in Encyclopedia of Chemical Technology, volume 7, pages 257 to 262, published by Interscience Publishers, Inc. (1951), or in US. Pat. 1,922,459.

Any suitable polyhydric polythioether may be used such as, for example, the condensation product of thiodiglycol or the reaction product of a polyhydric alcohol such as is disclosed above for the preparation of the hydroxyl polyesters with any other suitable thioether glycol. Other suitable polyhydric polythioethers are disclosed in US. Pats. 2,862,972 and 2,900,368.

-Any suitable polyhydric alcohol may be used as the active hydrogen containing compound such as, for example, alkane diols such as, for example, ethylene glycol, 1,3-propylene glycol, 1,2-propylene glycol, 1,4-butylene glycol, 1,3-butylene glycol, 1,5-pentanediol, 1,4- butanediol, 1,3-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 2,2-dimethyl-l,3-propanediol, 1,8-octanediol and the like including 1,20-eicosanediol and the like; alkene diols such as, for example, 2-butene-1,4-diol, 2-pentene-1,5-diol, 2-hexene-1,6-diol, 2-heptene-l,7-diol and the like; alkyne diols such as, for example, 2-butyne-l,4-diol, 1,5-hexadiyne-l,6-diol and the like; alkane triols such as, for example, 1,3,6-hexanetriol, 1,3,7-heptane triol, 1,4,8-octane triol, 1,6,l2-dodecane triol and the like; alkene triols such as 4-hexene-l,3,6-triol and the like; alkyne triols such as 2-hexyne-l,4,6-triol and the like; alkane tetrols such as, for example, 1,2,5,6-hexane tetrol and the like; alkene tetrols such as, for example, 3-heptene-l,2,6,7-tetrol and the like; alkyne tetrols such as, for example, 4-octyne- 1,2,7, 8-tetro1 and the like.

Any suitable aliphatic thiol including alkane thiols containing two or more SH groups may be used such as, for example, 1,2-ethane dithiol, 1,2-propane dithiol, 1,3- propane dithiol, 1,6-hexane dithiol, 1,3,6-hexane trithiol and the like; alkene thiols such as for example, Z-butene- 1,4-dithio1 and the like; alkyne thiols such as, for example, 3-hexyne-1,6-dithiol and the like.

Any suitable polyamine may be used including, for example, aromatic polyamines such as, for example, p-amino aniline, 1,5-diamino naphthalene, 2,4-diaminotoluene, 1,3,5-benzene triamine, 1,2,3-benzene triamine, 1,4,5,8-naphthalene tetramine and the like; aliphatic polyamines such as, for example, ethylenediamine, 1,3-propylenediamine, 1,4-butylenediamine, 1,3-buty1enediamine, diethylenetriamine, triethylenetetramine, 1,3,6-hexane triamine, 1,3,5,7-heptane tetramine and the like; heterocyclic polyamines such as, for example, 2,6-diamino pyridine, 2,4-diamino--aminomethyl pyrimidine, 2,5-diamino- 1,3,4-thiadiazole, piperazine and the like.

One especially preferred group of amines useful for preparing polymers are polyamines having the primary amine groups thereof blocked by ketimine or aldimine groups. The reaction of carbonyl compounds with the primary amine groups can be illustrated as follows:

where R and R are organic radicals, are each substantially inert to the ketimine or aldimine formation reaction and are preferably hydrogen or short chain alkyl groups (1 to 4 carbon atoms). Preferred compounds are low molecular weight (C -C aldehydes or ketones that are volatile so that an unreacted excess thereof may easily be removed by conventional distillation practices when the reaction is completed. Such volatile compounds are also preferred so that when the blocked polyamine is mixed with the diisocyanate and exposed to moisture, the freed aldehyde or ketone can be easily removed from the reaction mixture. Examples of preferred carbonyl compounds include such aldehydes and ketones as acetone, methyl ethyl ketone, methyl n-butyl ketone, methyl tertbutyl ketone, ethyl isopropyl ketone, acetaldehyde, propionaldehyde, butyraldehyde, isobutyraldehyde, and the like (i.e. including hexanone and hexanal). The polyamines to be blocked preferably have the structure where R is a difunctional aliphatic group containing from 248 carbon atoms, R is an aliphatic group containing 1-24 carbon atoms and n is an integer of from 020. Representative R radicals are methyl, propyl, butyl, decyl, hexadecyl, hexenyl, octenyl, tridecenyl, octadecyl, undecynyl and the like. Inert or non-interfering groups such as Cl, nitro and the like may be present on R and/ or R Any suitable reaction product of a phenol with an alkylene oxide yielding a compound containing active hydrogens may be used such as, for example, those disclosed in US. Pat. 2,843,568, such as for example, the reaction product of hydroquinone with ethylene oxide to give a polyalkylene arylene ether glycol having a molecular weight above about 750 or other polyalkylene arylene ether glycols disclosed in said patent.

8 Any suitable reaction product of a phenol-aldehyde resin with an alkylene oxide may be used such as, for example, a novolac having the formula OH OH OH R R11 R wherein n is 1 to 5 and R is a lower alkyl radical such as methyl, ethyl, propyl, butyl, tertiary butyl and the like reacted with an alkylene oxide such as those disclosed above for the preparation of the polyhydric polyalkylene ethers.

Any suitable reaction product of an amine with an alkylene oxide may be used such as, for example, the reaction product of an alkylene oxide with a tolylenediamine such as, 2,4-tolylenediamine, 2,6-tolylenediarnine or the like, a diphenylmethane diamine such as 4,4'-diaminodiphenylmethane or the like, xylylene diamine, as well as alkylene diamines such as, for example, ethylenediamine, propylenediamine, 1,4-butylenediamine, hexamethylenediamine and the like including 1,10-dodecane diamine.

Any suitable phenol may be used such as, for example, 2,2-bis(p-hydroxyphenyl)propane (bisphenol A) and the like.

Any suitable polyamide may be used such as, for example, those obtained by reacting adipic acid with hexamethylenediamine and the like.

Any suitable polyacetal may be used such as, for example, the reaction product of formaldehyde or other suitable aldehydes with a polyhydric alcohol such as those disclosed above for use in the preparation of the hydroxyl polyester.

Other alcohol compounds which do not necessarily fit within any of the previously set forth classes of compounds and which nevertheless contain active hydrogen containing groups which are quite suitable for the production of the polymers are pentaerythritol, sorbitol, triethanolamine, mannitol, N,N,N,Ntetrakis(2-hydroxypropyl)ethylenediamine, as well as compounds of any of the classes set forth above which are substituted with halogen such as, for example, chloro, iodo, bromo and the like; nitro; alkoxy, such as, for example, methoxy, ethoxy, propoxy, butoxy and the like; carboalkoxy such as for example, carbomethoxy, carboethoxy and the like; dialkyl amino such as, for example, dimethylamino, diethylamino, dipropylamino, 'methylethylamino and the like; mercapto, carbonyl, thiocarbonyl, phosphoryl, phosphato and the like.

Other substances which can be used include natural substances such as castor oil and the like.

The molar proportions of the diisocyanate and the compounds bearing Zerewitinoff active hydrogen atoms can vary widely. Those skilled in the art can determine the proportions of reactants best suited for a particular purpose. For example, when making polyurethane elastomers, one often uses approximately equimolar amounts of glycol and the diisocyanate. Preferably, the active hydrogen containing compound will be used in a molar ratio to the diisocyanate of 1:10 to 10:1.

The polymers can be prepared by reacting the diisocyanate and the active hydrogen containing compound at subatmospheric, atmospheric or superatmospheric pressure. Atmospheric pressure is preferred. The reaction can be operated over a wide range of temperatures. Those skilled in the art will recognize that there are great differences in the relative reactivity of various groups containing active hydrogen atoms, amines reacting faster than alcohols, primary alcohols reacting faster than tertiary alcohols-to name a few examples; accordingly, one will select a tem perature at which the reaction occurs at a rate convenient for the purpose at hand. Preferably, the reaction temperature ranges between about 20 C. and C. However, the temperature is not critical.

If desired, the reaction may be carried out in an inert solvent. Representative solvents include tetrahydrofuran, o-dichlorobenzene, chlorobenzene, xylene, methyl isobutyl ketone, toluene and ethyl acetate. In general, the solvent should be free from isocyanate-reactable groups such as groups bearing Zerewitinotf-active hydrogen atoms.

In the preparation of the polymers, a portion of the diisocyanates (i.e. up to about 90 mole percent and preferably from to 50 mole percent) can be replaced by known polyisocyanates. Representative of such known polyisocyanates are ethylenediisocyanate, hexamethylenediisocyanate, butylene-1,3-diisoeyanate, ethylidene diisocyanate, butylidene diisocyanate, l,2,4-butanetriisocyanate, 1,3,3 pentanetriisocyanate, p-phenylene-2,2'-bis(ethylisocyanate), 1,4 naphthalene 2,2 bis (ethylisocyanate) chloro phenylene-l,3-bis (propyl-3-isocyanate), tolylene diisocyanate, m-phenylene diisocyanate, p-phenylene diiso cyanate, diphenylene-4,4'-diisocyanate, xylylene-1,4-diisocyanate, 4,4-diphenylenemethanediisocyanate and the like. A particularly desirable group of polyisocyanates to be employed in combination with the inst-ant diisocyanates in the preparation of the polymers are those described in the application of Rogier and Kamal, 'Ser. No. 250,211, filed I an. 9, 1963, entitled Polyi-socyanates and Derivatives, now Pat. 3,455,883. These polyisocyanates are derived from polymeric fat acids and have the following idealized structural formula:

[R [(CHmNco] where y is 0 or 1, x is an integer of 2 to about 4 and R is the hydrocarbon group of polymeric fat acids. Preferably, x is 2. The polyisocyanates of the above formula wherein y is 0 are prepared by converting the polymeric fat acids to the corresponding polymeric acid chlorides, reacting the acid chlorides with a metal azide to form the polymeric acyl azides and then heating the acyl azides to produce the polyisocyanates. The polyisocyanates wherein y is 1 are prepared by converting the polymeric fat acids to the corresponding polynitriles and then hydrogenating the polynitriles in the presence of ammonia and a catalyst such as Raney nickel to form polyamines. The polyamines are then reacted with phosgene to give the polyisocyanates.

EXAMPLE G A coating composition was prepared by adding 7.4 g. of diisocyanate as prepared in Example D and 8.1 g. of a ketimine blocked polyamine to 6.6 g. mineral spirits. The ketimine blocked polyamine was prepared by reacting one mole of diethylenetriamine with two moles of methyl isobutyl ketone, the secondary amine group of the polyamine being blocked by reacting the above product with the diisocyanate of Example D in a molar ratio of 2 to 1 to give a compound of the formula:

where R is the residue of the diisocyanate exclusive of the isocyanato groups. Three mil thick coatings of the composition were cast on tin, glass and Carrara white glass. The coatings became tack free in 4-5 hours. After 14 days cure at 70 F. and 50% relative humidity, the coatings had these properties: Pencil Hardness on glass= 6B; Sward Rocker Hardness on glass=13.3; and G. E. Extensibility on tin= 60%. After 1000 hours exposure in a Xenon Arc Weather-Ometer, thecoating on Carrara glas had a yellowness of 5.9 (initial 5.0) and 60 gloss reading of 30 (initial 94).

EXAMPLE H Example G was repeated except that the ketimine blocked polyamine was replaced by 9.5 grams of a compound prepared in the same manner except that dimeryl isocyanate was used in the preparation thereof. The dimeryl isocyanate had the structural formula D (CH NCO) 2 Where D is the dimeric fat acid radical derived from the mixture of dimerized fat acids obtained from the fat acids in tall oil consisting mainly of a mixture of dimerized linoleic and oleic acids. The compound had the formula isobutyl O 0 1H; C Hz l) isobutyl isobutyl where n is 5 to 20, m is 0 to 15, the sum of n and m is 14 to 20 and R R and R are hydrogen or alkyl groups of 1 to 4 carbon atoms.

2. The diamine of claim 1 wherein R R and R are hydrogen.

3. The diamine of claim 1 wherein the sum of n and m is 16.

4. The diamine of claim 1 wherein the sum of n and m is 16 and R R and R are H.

5. The diamine of claim 1 wherein n is 9 and m is 7.

6. The diamine of claim 1 wherein n is 8 and m is 8.

7. The diamine of claim 1 wherein n is 7 and m is 7.

8. The diamine of claim 1 wherein n is 6 and m is 10.

9. The diamine of claim 5 wherein R R and R are hydrogen.

References Cited UNITED STATES PATENTS 2,532,277 12/1950 Castle 260584 C X 2,584,970 2/1952 Alexander et a1. 260-584 C 2,716,134 2/1955 Reynolds et al. 260-584 C X 3,151,113 9/1964 Advani et a1 260584CX CHARLES B. PARKER, Primary Examiner R. L. RAYMOND, Assistant Examiner US. Cl. X.R.

26077.5 AT, 453 AP, 465.5 

